do u need controller for wii wireless?

Ive seen the question a couple of times, but it have never been answered.. Is it required to hold a wii controller in your hand for the active 2.0 program, or does the 2 arm sensors track the motion???|||The Wii version needs the Wii Remote in the right hand for some of the exercises, but there are a lot where it is not needed. Before each exercise loads, an icon appears in the loading screen letting you know if the Wii Remote is needed or not.|||So far I've only had to use the remote for the sport exercises that require you to make a throwing motion or to catch something. All the standard running, lunging, resistance band exercises are remote free.